Steel casting.



NITED STATES PATENT OFFICE.

ANDRES G. LUNDIN, OF BOSTON, MASSACHUSETTS, ASSIGNOR, BY MESNE PLACE.

STEEL CASTING.

SPECIFICATION forming part of Letters Patent N 0. 670,453, dated March26, 19 01.

Application filed January 1 9| 1 89 9.

To aZZ whom it may concern:

Be it known that I, ANDRES G. LUNDIN, a subject of the King of Swedenand Norway, residing in Boston, in the county of Suffolk and State ofMassachusetts, have invented a new and useful Improvement in SteelCastings, of which the following is a specification.

My invention relates to the manufacture of steel castings containing theingredients IO mentioned below, such ingredients or constituents beingin the proportions hereinafter set forth.

The present invention is particularly adapted for the manufacture ofsteel castings of medium or light weight, including softand toughcastings, such as bicycle parts, and hard castings, such as chisels,hatchet-s, &c. I have found'by long experiment that such tools can becast by means of my method and the employment of the ingredientsproportioned as below specified and that the tools when cast are capableof receiving and retaining an excellent edge. Moreover, such castings asbicycle parts when made by my invention can be Welded, as I have foundby actual experiment, so that an occasional defect may be remedied bythe welding process.

In this invention I take steel scrap and melt it and add ferrosilicon,ferromanganese, and

aluminium in the manner and proportions indicated by the followingexample of manufacture:

One hundred (100) pounds of steel scrap is placed in a crucible in afurnace and melted to a boiling-point-say about 4,000 Fahrenheit. Whenthe boiling point has been reached, one and a half (1%) to two and ahalf (2 pounds of ferrosilicon containing twelve (12) per cent. siliconis thrown into the molten metal. After the ferrosilicon has melted two(2) to eight (8) ounces of ferromanganese containing eighty (80) percent. manganese is mixed with three pounds or less of aluminium, andthis mixture is thrown into the molten metal, in which it quickly melts.The resulting composition or alloy is,

after all its constituents parts are melted, poured into a mold and castinto the shape Serial No. 702,739. (No specimens.)

desired. It will thus be seen that the percentage in weight of theingredients added to the molten metal is substantially as follows: Ferrosilicon containing twelve per cent. silicon, 1.5 to 2.5 per cent;ferromanganese containing eighty per cent. manganese, .125 to .5 percent; aluminium, three per cent. or less.

It will readily be seen that the product of the above-described processis a trifle over one hundred pounds of metal, probably not more than onehundred and three or one hundred and four pounds, containing an additionto the original one hundred pounds of pure silicon 2.88 ounces to 4.8ounces, equaling .18 to .3 per cent; pure manganese, 1.6 ounces to 6.4ounces, equaling .1 to .4 per cent. aluminium, three pounds or less,equaling three per cent. or less, and the iron which bore the siliconand manganese.

Of course I do not confine myself to the employment of ferrosilicon orferromanganese with the exact proportions of silicon and manganesementioned; but if I use ferrosilicon containing a greater or lesspercentage than twelve per cent. of silicon or ferromanganese containinga greater or less percentage than eighty per cent. of manganese I varythe proportions of ferrosilicon and ferronianganese inserted in themolten metal so as to produce the above-mentioned proportions of puresiliconand pure manganese-viz., .18 to .3 per cent. of pure silicon and.1 to .4 per cent. of pure manganese in the product. a

I am aware that it is not broadly newin metallurgy to apply ferrosiliconor ferromanganose in certain proportions to molten metal, and I am alsoaware that aluminium has been used as an alloy in the manufacture ofiron and steel. In this invention it should be understood that theimprovement relates to the manufacture, of steel castings and also thatthe range of proportions above mentioned is essential in effecting thedesired result.

In the example of man ufactu re given above I have mentioned that thescrap is melted in a crucible. I do not, however, confine myself to theemployment of a crucible, as the scrap can be melted by the open-hearthpr0c-v ess, if desired.

Having thus fullydescribed my invention, what I claim, and desire tosecure by Letters Patent, is-

As a new and improved article of manufacture, steel castings containing.18 per cent.

to .3 per cent. of silicon, .1 per cent. to .4 per cent. of manganeseand three per cent. or less of aluminium.

ANDRES G. LUNDIN. Witnesses:

HENRY W. WILLIAMs, A. N. BONNEY.

